托福TPO 7 听力Lecture第2篇第5题_According to the professor, why does a pine tree produce a "smooth" echo?

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题目

According to the professor, why does a pine tree produce a "smooth" echo?

Because it has a smooth trunk

Because it has large branches spaced at regular intervals

Because it has many small, densely packed needles

Because it remains stationary in all types of weathe

题目解析

题目对应教授所说：A pine tree with others’ little densely packed needles. Those produce a large number of faint reflections in which what’s called as: a smooth of echo. 其大意为：松针并不茂密的松树能产生大量微弱的反射，我们称之为“平滑回声”，所以“平滑回声”的产生与松针密切相关，选项 C 说法正确。

答案: C

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